Method of and machine for trimming



Feb., La 193g. W, H, NUN 2,105,177

METHOD OF AND MACHINE FOR TRIMMING Filed June 10, 1,955

Patented Feb. 15, 1938 UNITED STATES METHOD oF AND MAoinNE Fon TRIMMTNWilliam H. Nutt, Beverly, lMass., assigner to United Shoe MachineryCorporation, Paterson, N. J., a corporation of New Jersey ApplicationJune 10, 1935, Serial No. 25,766

16 Claims.

This invention relates to methods of, and machines for, trimmingwork-pieces with a skiving out, as, for example, skiving off the lumpsformed on the bottom of the toe of a lasted shoe by the pleats in theoverdrawn margin of upper materials rthat confront the insole. In sometypes of shoes adhesive cement is used not only to secure the Yoverdrawnupper materials that lie on the toes of the insoles, but also to securethe outsoles, except at the heel-seats. Consequently, to prepare acement-lasted toe for the reception of an outsole it is necessary totrim off the lumps above mentioned, but at the same time it is alsonecessary to avoid trimming the overdrawn materials to a depth thatwould impair the strength of the connection between the upper and theinsole.

This trimming operation has heretofore been `performed by feeding alasted shoe toe-foremost to; the cutting edge of a power-driven skivingblade, in consequence of which the cutting begins outside the lumps andprogresses toward the heel of the shoe, With the result that the cutter,if not quite sharp, tends to rideover the lumps instead of cuttingthrough them. Moreover, if the initial point of attack is not positivelycontrolled as it should be withregard to the depth of cutting, thecutting edge may beginto cut too near the'perimeter of the toe and takeoff more of the overdrawn upper materials than the shoe can spare.

To avoid the risks due to such conditions the present invention providesan improved method of skiving the pleats from the toe of the overdrawnVVmargin of upper materials that confront the bottom of the insole of alasted shoe, which consists in placing the unpleated portions of saidmargin at the sides of the bottomr of the forepart :of the shoe inface-to-face contact with an edgeforming face of a skiving element Whilethe pleats at the toe of the shoe lie beyond'the skiving edge, 40 andmoving the shoe heel-end foremost to feed kthe pleats at the toe againstthe skiving edge.

One advantage of such a method is that it provides for utilizing theunpleated portions` of the overdrawn margin of upper materials to insurethat the, skiving cut willbe flush with the outer surface of thoseportions. Moreover, since the skiving begins at the inner edge of theoverdrawn margin where the pleats are abrupt and progresses toward theperimeter of the toe where'no pleats exist, the skiving element, even ifnot quite sharp will attack the pleats with certainty and complete itscutting well inside the outer boundary of the overdrawn margin.

The invention also provides an improved trimming machine whereby shoesmay be trimmed in accordance with the method above pointed out. To thisend a feature of the invention consists in a trimming machine comprisinga rotary driven cutting disk the diameter of which exceeds the greatestwidth of a shoe, the disk having an un- 5 obstructedflat face andacutting edge thereon arranged to skive pleats from the toe of theoverdrawn margin of upper materials on the `bottom of a lastedshoe fedheel-end foremost while the bottom of the forepart lies in face-toefacecontact with the unobstructed flat face ofV the disk, andV work-guidingmeans arranged to abut one side of the forepart of a shoe so fed.

Preferably, and as herein shown, the cutting disk is annular, and itscentral opening is unob- 1,5 structed and of sufficient size to receivethe pleated substance to be severed from a shoe. Moreover, the inneredge that defines the central opening is sharpened Ato do the cutting orskiving, While the outer Aedge of the disk has no cutting function andmay be used to lmount the disk on itscarrier.

' One advantage of such a disk is that it may be very thin without beingflexed by the pressure of the Work against it, since its outer marginmay be amply braced by the carrier to which it is. attached. Another isthat even if it is surrounded by a guard Vvisibility of its operatingportion need not be obscured by the guard. Still another is thattheinterior location of its cutting edge `provides a factor of safety notonly when the disk is set up for use but also when it is detached.` Whenit is in operation the disk, if surrounded by a guard to conne thesevered substance, Will carry the severed pieces away from the point ofoperation and discharge them by centrifugal force only` Where the guardprovides an opening for their escape.

, Referring to the drawing,

Fig. 1 isa right side elevation of a trimming machine embodying theseveral features of the 40 presentrinven'tion'; v

Fig. 2 is a sectional plan view of the. elements Within the range ofline II-II of Fig. 1;

Fig. 3 is a vertical section on a larger scale including the rotarycutter-head, a guard. therefor and the forepart of a lasted shoe inprocess of being trimmed; l

Fig. 4 is a top plan View including the operating segment of the cuttingdisk, the toe portion of a lasted shoe and a chip or scrap of pleatedmaterial severed from the shoe and lying on the disk;

Fig. 5 is a perspective View of a segment of the cutting disk; and l Y nj.

Fig. 6 is an elevation, partly in section, includ- 55 ing means forconnecting the trimming guide to the cutter guard.

The frame of the machine comprises a flat base IIB and an overhangingarm II provided with spaced bearings I2 for a vertical cutter-shaft I3,the lower portion of the frame being divided or arche-d to provide aspace for an electric motor I4 that may be bolted to the base. A drivingpulley I5 carried by the shaft of the motor operates a belt I6 that runson a pulley I1 secured to the cutter-shaft i3. Intermediate portions ofthe belt run over a pair of idle pulleys mounted on the frame, one ofthe latter pulleys` being indicated at I8 and the other being coaxialtherewith.

The trimming cutter is anannular sheet-steel disk 2U the diameter ofwhich exceeds the greatest width of a shoe. When the disk is set up foruse its inner an-d outer edges are concentric with its axis of rotation.The bottom face of the cutting disk is flat and its inner edge issharpened to provide a cutting edge 2I by grinding the inner margin ofthe upper face. The disk is carried by a spider 22 which, as shown inFig.'2, comprises three equally spaced arms or spokes that constitute achuck. The hub of the spider is secured to the vertical shaft I3 asshown in Fig. 3, a set-screw 23 being provided for that purpose.

Since the flat lower face of the cutting -disk is intended to lie inface-to-face contact with the unpleated portions of the overdrawn margin50 on the upturned bottom of a lasted shoe, to the end that it mayfunction as a gage toinsure flush trimming of the pleats 5I, the arms ofthe spider 22 are provided with rabbets to receive the outer margin ofthe disk and form flush connections as shown in Fig. 3. At least one ofthe arms, but preferably each of them, is provided with an axiallyextending kerf 24 that intersects the rabbet therein to provi-de aresilient radially movable clamping jaw 25. A clamping screw 26 extendsthrough this jaw and is screwed into a rigid portion 21 at the interiorside of the kerf. The portions 21 provide seats for the upper surface ofthe cutting disk, while the resilient clamping portions 25, which extendslightly below the portions 21, are arranged to clamp the disk edgewise.Preferably the perimeter of the disk is provided with three notches, asshown in Figs. 2 and 5, to receive the jaws 25. The surfaces 28 of thesenotches and the clamping faces of the jaws are undercut to insure aninterlocking relation and positive retention ofthe disk when the jaws 25are set up tightly against it, and at the same time to draw the upperface of the disk firmly against the seats provided by the rigid portions21 of the spider.

The cutter-head is surrounded by a. stationary guard 30 comprising astrip or band of sheet metal bent to provide a curved segment'and twotangent portions. The latter are secured to the frame under the arm I Iby bolts'SI. The tangent portions are arranged to form a throat 52remote from the operating locality through which severed chips mayescape from the perimeter of the cutting disk and fall. The lower edgeof this guard, at the front of the cutter-head, where the shoes are tobe presented for trimming, is preferably slightly above the plane of thelower face of the cutter to avoid contact with the work (see Fig. 3),but at other points where there is no likelihood of interference betweenthe guard and the work the lower edge of the guard may project to alower level. A hole 29 in the guard (Fig. 1)

affords access to the clamping screws 26 for a screw-driver.

The guard may be braced and centered by a supporting hanger which, asshown, comprises a hub or collar 32 and two diametrically opposite armsor spokes 33 screwed into it. The collar is loosely mounted on the shaftI3 and is supported by the hub of the rotary spider 22. The outer endsof the arms 33 extend downwardly outside the guard 35 and may be aflixedthereto by rivets 31% or other means that will not obstruct rotation ofthe spider 22.

The guard 3Q may also be utilized to support a work guide 35 in aposition to underhang the cutting disk and abut one side of the forepartof a shoe While the bottom of the shoe is held against the lower surfaceof the disk 20. As shown in Figs. l, 2, and 6, the work guide 35comprises a strip of sheet-metal having a transverse bend between itsends whereby it is provided with two angularly related arms. The outerextremity of one of these arms is mortised into a kerf formed in acylindrical pin or stem 36 and is affixed thereto as by rivets 31. Thestem 33 projects upwardly through a strap or bearing 38 riveted to theouter surface of the guard 35 and may be retained therein by aCotter-pin 39. This manner of mounting the guide 35 provides forsecuring it in its operative position underlying the cutting disk 23,and also provides for swinging it away from that position (see theall-dotted line position in Fig. 2) to facilitate attaching anddetaching the trimming disk.

To provide for securing the guide 35 in its operative position, anangle-piece 40 (Fig. 6) is secured thereto by countersunk rivets 4I, anda complemental angle-piece 42 is secured to the outer surface of theguard 30 by rivets 43. When the guide is in its operative position, thehori- Zontal ear of the member 40 underlies and engages a horizontal earat the lower end of the angle-piece 52. The ear of the piece 40 is boredand tapped with a screw-thread to receive the shank of a thumb-screw 44,and the complemental ear of the piece 42 is provided with a notch intowhich the shank of the thumb-screw may enter without detaching thethumb-screw from the piece 40. When these parts are in their cooperativerelation it is only necessary to screw down the thumb-screw 44 to clampthe pieces 4D and 42 tightly one against the other.

The lasted shoe represented in Figs. l, 2, 3, and 4 is a typical exampleof work with which the present invention is concerned, the overdrawnmargin 55 of upper materials being secured to an insole 5I inconfronting relation thereto by adhesive cement at the toe-end if notalso throughout the forepart and the shank portion, although, so far asthe problem under consideration is concerned, other means, such aslasting staples, may be used to secure this margin elsewhere than at thetoeend. In any event, the lasting of the toe-end produces pleats 5I(Fig. 4) which, after the attaching cement takes effect, must be severedsubstantially flush with the general plane or level of the unpleatedportions of the margin adjacent thereto.

The cutter-head is preferably driven in the direction indicated by anarrow in Fig. 2 and by arrow a in Fig. 4, rather than in the oppositedirection, to the end that the guide 35 will be effective to brace theshoe against lateral displace ment by the frictional drag of the cutter20. To perform the desired trimming operation in accordance with theimproved method herein set forth, the loperator will lay the -forepartof a shoe in thepalm of the left hand and grasp the counter portion withthe right hand. The thumb of the yleft hand `may underlie the toe of theshoe without risk of being cut.

The operator will then thrust the shoe toeforemost under the cutter-headfar enough to carry the pleated substance 5I beyond the cutting edge ofthe operating segment of the cutter and will then raise the shoe toplace the unpleated portions of the overdrawn margin 50 in face-to-facecontact with the under surface of' the cutting disk, at the same timeplacing the right-hand side of the forepart against the guide 35. Now,the operator moves the shoe heel-end foremost, thereby feeding thepleated substance 5l against the cutting edge 2l of the operatingsegment of the cutter. A movement of about one inch is usuallysufficient to Aeffect the severing of all the pleated substance 5I.While the guide, 35 controls the path of lengthwise movement of theshoe, the lower surfaceA of= the trimming disk 20 controls the depth ofthe trimming cut, and since the trimming disk overlaps and projectsbeyond the unpleated portions of the overdrawn margin 50 it prevents thecutting of any substance other than the pleats and the lasting cementadhering to them.

'Ihe cutting edge first attacks the pleats at the inner edge of themargin 50 where they are abrupt and of the greatest magnitude (see Fig.3). As the shoe is fed heel-end foremost (as indicated by arrow b) thecutter skives the pleated substance until the cutting edge runs out ofthe pleats well inside the outer boundary of the margin 50, asillustrated in Figs. 2 and 4.

Once a chip has been completely severed and is detached from the shoe,it is carried around with the cutting disk either by its frictionalengagement therewith or by one of the arms 22 of the cutter-head, butthe guard 30 is so arranged as to prevent the severed chips from beingthrown out by centrifugal force until they have been carried to the rearof the cutter-head where they may escape and drop through the throat 52(Fig. 2) bounded by the converging tangent portions of the guard.

Although the forward portion of the guard extends across the forepart ofa shoe in operative position, it is s far in front of the cuttingportion of the cutter that the operator may see over it to observewhether or not the pleated substance I has been located in the desiredpreliminary position in the central opening of the cutter before hemoves the shoe heel-end foremost to effect the actual severing of thatsubstance. Moreover, although the arms 22 of the cutter-head move acrossthe line of vision their speed of rotation is such as to counteracttheir tendency to obstruct visibility of the work.

Having described my invention, what I claim as new and desire to secureby Letters Patent lof the United States is:

1. That improvement in methods of skiving the pleats from the toe of theoverdrawn margin of upper materials that confront the bottom of theinsole of a lasted shoe which consists in placing the unpleated portionsof said margin at the sides of the bottom of the forepart inface-to-face contact with an edge-forming face of a skiving elementWhile the pleats at the toe of the shoe lie beyond the skiving edge, andmoving the shoe lengthwise heel-end foremost to feed the pleats at thetoe against the skiving edge.

2. A trimming machine comprising a rotary driven cutting disk thediameter of which exceeds the greatest width of a shoe, said disk havingan unobstructed iiat face and a cutting edge on 4said face arranged toskive pleats from the toe of the overdrawn margin of upper materials onthe bottom of a lasted shoe fed heel-end foremost while the bottom ofthe forepart lies in face-to-face contact with said flat face, andwork-guiding means arranged to abut one side of thevforepart of a shoeso fed.

3. A trimming machine comprising a rotary driven cutter-head providedwith an annular skiving disk having an exterior work-guiding face theinner edge of which is a skiving edge arranged to operate on work fedaway from the axis of r0- tation while guided by said face.

LA trimming machine comprising a rotary driven cutter-head provided withan annular skiving disk having a yflat work-engaging face the inner edgeof which is a skiving edge arranged to operate on work fed away from theaxis of rotation in contact with said flat-face.

5. A trimming machine comprising a driven spider arranged to rotate`about a vertical axis, and an annular skiving disk arranged below andsecured to the arms of said spider, the inner edge of said disk being asharp skiving edge and being visible through the spaces between the armsof said spider.

6. A trimming machine comprising a driven cutter-head arranged to rotateabout a vertical axis, the bottom of said cutter-head being an annulardisk having an interior cutting edge, and the cutter-head havingopenings above said disk to aiford visibility of said cutting edge froma level above the cutter-head.

7. A trimming machine comprising a driven cutter-head arranged to rotateabout a vertical axis, the bottom of said cutter-head being an annulardisk having an interior cutting edge, and a guard surrounding saidcutter-head to provide a barrier against the broadcast of severed chipsby centrifugal force from said disk.

8. A trimming machine comprising a driven spider arranged to'rotateabout a vertical axis, an annular disk having an interior cutting edge,the outer margin of said disk being secured to said spider, and astationary guard surrounding said. spider and arranged to form a barrieragainst the broadcast of severed chips by centrifugal force from saiddisk.

9. A trimming machine comprising a driven spider arranged to rotateabout a vertical axis, an annular disk having an interior cutting edge,the outer margin of said disk being secured to the arms of said spider,a stationary guard surrounding said spider and arranged to form abarrier against the broadcast of severed chips by centrifugal force fromsaid disk, said guard having an opening above said disk to alfordvisibility of said cutting edge, and an opening remote from theoperating locality through which the severed chips may escape.

10. A trimming machine comprising a frame having an overhanging arm, avertical cuttershaft journaled in said arm, a spider secured to saidshaft below said arm, an annular cutting disk carried by said spider andhaving an interior cutting edge, and a stationary band having a curvedsegment closely surrounding a segment of said disk and alsoI havingtangent portions secured to said frame and forming a throat under saidarm through which severed chips may fall from the perimeter of saiddisk.

11. A rotary cutter-head comprising an annular cutting disk having aninterior cutting edge, and a spider having jaws arranged to clamp theperimeter of said disk edgewise, at least one of said jaws beingradially movable to facilitate insertion and removal of said disk.

12. A rotary cutter-head comprising an annular cutting disk and acarrier therefor, said disk having an interior cutting edge and undercutportions at its outer edge, and said carrier having undercut clampingmeans arranged to cooperate with said undercut portions of the disk tosecure the latter.

13. A rotary cutter-head comprising an annular cutting disk having aninterior cutting edge, and a spider having radially resilient jawsarranged to clamp the perimeter of said disk edgewise, the spider alsohaving seats for the inner face of the disk to` locate the outer facethereof in ush relation to the extremities of said jaws.

14. A rotary cutter-head comprising an annular cutting disk having aninterior cutting edge, and a spider having rabbets in the extremities ofits arms to receive the outer margin of said disk, one or more of saidarms having an axially extending kerf intersecting the rabbet therein toprovi-de a radially resilient jaw arranged to clamp the disk edgewise,and means arranged to set up said resilient jaw or jaws to secure thedisk in said rabbets.

15. A trimming machine comprising a arranged to rotate about a verticalaxis, a cutting disk secured to the bottom of said carrier, a stationaryguard arranged to confine severed chips on the upper surface of saiddisk, and a work-guide secured to said guard and arranged to extendunder said disk.

16. A trimming machine comprising a carrier arranged to rotate about avertical axis, a cutting disk secured to' the bottom of said carrier, astationary guard arranged to confine severed chips on the upper surfaceof said disk, a workguide pivotally connected to said guard and arrangedto' swing about its pivotal connection to and from its operativeposition under said disk, and means arranged to secure the work-guide insaid operative position.

WILLIAM H. NUTT.

carrier

